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Topic Review (Newest First)
05-03-2012 05:27 PM
hpete A 10cc dish with proper (.040) quench, .030 overbore, 3.75 stroke and a 5.7 in rod yields 9.2:1 static compression with 64cc heads.
05-01-2012 04:09 PM
cobalt327
Quote:
Originally Posted by Silverback
- the swirlport heads will be too big for good compression if they are off a 350, but fine if they're off of a 305.
Good point, I automatically assumed 5.7L heads.
05-01-2012 03:52 PM
68NovaSS
Quote:
Originally Posted by kewpie79
I do know there are 9/16 cranks, did a search on here to learn all about them.
If you mean a "3 - 9/16 stroke" crank, and know what it means, why didn't you just say it?

Quote:
Originally Posted by kewpie79
I guess you failed reading and comprehension in school. Read the first line of the post .
And then you throw more attitude? That statement was uncalled for, will not be tolerated. Take a timeout.
05-01-2012 01:38 PM
Silverback That depends on your goals. The cheapest approach to getting more power in a decent cruiser is to find a 350 or someone's abandoned project and swap it in, it will bolt in the place of the 305 with no other changes.

If you have a reason for keeping the 305, then go for it (I've always wanted to build a stroker 305 just to tinker with some of the advantages of the small bore 305 and see if I can get around the breathing problems, but that's a different discussion).

Things to note:
- the swirlport heads will be too big for good compression if they are off a 350, but fine if they're off of a 305. If they're off a 350 you'll probably want to get them milled to get the chambers down below 60cc. FWIW the swirlport design is actually an interesting complement to the stroker 305, which should help build torque and control detonation making for a surprisingly efficient engine.
- most aftermarket heads will not fit, anything with larger than 1.94/1.50 valves will be a problem.
- What year Z28? Be aware that they will use different balancers, flywheels, some gaskets... and the later heads will use the >86 intake pattern
05-01-2012 01:23 PM
kewpie79 I guess you failed reading and comprehension in school. Read the first line of the post .
05-01-2012 12:09 PM
cobalt327
Quote:
Originally Posted by kewpie79
I do know there are 9/16 cranks, did a search on here to learn all about them.
That's it? That's all that you have to add?

Using "9/16" is an antiquated way of describing a stroker crank size. I know the term is still in use, but if you want to talk stroker cranks- especially SBC stroker cranks (and not early Hemi or flathead Ford, etc.)- you might want to use the more common decimal/fractional measurements, i.e. 3.48" stroke is stock 350/305/267 crank size, 3.75 (or 3-3/4" if you prefer) is the stroke of a 400 SBC and is by FAR the most common size stroker crank to use in a 4" bore SBC block (327/350), but you'll be hard pressed to find anyone using "3/4 stroker" when describing it.

Unless you're trying to fit into an oddball class displacement rule or trying to cheat, there's little point in not using as much stroke as can be used w/o needing to jump through too many hoops (like is required to use a 4" stroke in a SBC, for instance). That means a 3.75" stroke. Which is (as I've already said) what's needed to get 334 cid out of a 305 block. The same crank w/different pistons will get you 383 cid from a 4.030" bore SBC.
05-01-2012 11:21 AM
kewpie79 I do know there are 9/16 cranks, did a search on here to learn all about them.
04-30-2012 09:31 PM
cobalt327
Quote:
Originally Posted by kewpie79
I profess to know very little about engine building. With that out of the way, the engine going into my 84 GP, which is going to be a cruiser, not a racer. It has the following:
305 block from Z28
Swirl port heads from a 93 pickup
9/16 crank
bored 40 over (not sure if that is the correct terminology)
Lunati barebones cam and lifters
dish pistons
flowtech headers
Any problems with this? Also what kind of power will it generate?
(stock rear end and tranny by the way)
The heads have nominal 64cc chambers- way big for making decent compression w/a 305 or 334.

BTW, a 334 is a 3-3/4" crank in a 305 (0.030" over, I believe). The idea of stroking a 305 is not a particularly good plan, when 4" bore hydraulic roller capable blocks/short blocks/Vortec L31 long blocks are so easily and cheaply available.

If it was me, I'd take the guts out of the 305, get a different set of pistons and install it all back in a 4" bore block. If you want to reuse the cam (keep the lifters on the same lobes they were on in the 305), you can use any block (327 or 350, except the Gen 2 LT1/4 engines) but I'd recommend a hydraulic roller block so if in the future you wanted to upgrade to a roller, you could do so easily.

The stock differential is weak, you will need to upgrade if you make any real power and have traction.

You might want to read up on the subject.
04-30-2012 08:06 PM
zildjian4life218
Quote:
Originally Posted by 68NovaSS
9/16's crank?
Took me awhile to figure that out.. im assuming 3.562" stroke crank... but yeah we need way more details.
04-30-2012 04:27 PM
68NovaSS Need much more information for a power guestimate. What heads, chamber volume, what piston dish volume in cc's, what cam specs, lift, duration, what intake manifold, carb, what exhaust, style, size, what ignition?

9/16's crank?
04-30-2012 11:56 AM
kewpie79
334 stroker or not?

I profess to know very little about engine building. With that out of the way, the engine going into my 84 GP, which is going to be a cruiser, not a racer. It has the following:
305 block from Z28
Swirl port heads from a 93 pickup
9/16 crank
bored 40 over (not sure if that is the correct terminology)
Lunati barebones cam and lifters
dish pistons
flowtech headers
Any problems with this? Also what kind of power will it generate?
(stock rear end and tranny by the way)

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